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Streptomyces chengbuensis sp. nov., isolated from the rhizosphere soil of Cathaya argyrophylla


Strain HUAS CB01T was a novel actinobacterium which was isolated from the rhizosphere soil of Cathaya argyrophylla, Chengbu Miao Autonomous County of Hunan Province, China. The strain formed well-growing substrate mycelium, diffusible pigments, and aerial mycelium, and differentiated into spiral-type spore chains composed of smooth-surface rod-shaped spores. Phylogenetic analysis on account of 16 S rRNA gene sequence demonstrated the strain HUAS CB01T was a member of the genus Streptomyces and had a close relationship with Streptomyces wuyuanensis CGMCC 4.7042 T (100%) and Streptomyces marianii ICN19T (99.86%). Genome-based comparisons indicated that strain HUAS CB01T could be distinctly different from its closest species, Streptomyces wuyuanensis CGMCC 4.7042 T, Streptomyces marianii ICN19T, with ANIm and dDDH results of 92.78% and 45.90%, 92.22% and 43.30%, respectively, far less than 96.7 and 70% cut-off points recommended for delineating species. The main cellular fatty acids concluded anteiso-C15:0, iso-C14:0, iso-C16:0, C16:0 and C16:1 2OH. The menaquinones were MK-9(H4), MK-9(H6) and MK-9(H8) and the whole-cell sugars consisted of ribose and mannose. The polar lipids included phosphatidyl ethanolamine, diphosphatidylglycerol, phosphatidylglycerol, mannosides and unidentified phospholipids. According to these genotypic and phenotypic characteristics, strain HUAS CB01T can be distinguished and representative to be a novel species of the genus Streptomyces, for which the name Streptomyces chengbuensis is proposed. The type strain is HUAS CB01T ( = MCCC 1K08666T = JCM 36277 T).

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The authors sincerely thank Zeng Zhihong and Xu Wangjie (Wuhan Benagen Technology Co., Ltd, Hubei, China) for giving great help in gene sequencing.


This research was funded by the project of Hunan Provincial Education Department (23B0659), Hunan Provincial Natural Science Foundation (2023JJ40464 and 2024JJ7300), Research start-up fee for Hunan University of Arts and Sciences (22BSQD27), Central guidance local science and technology development fund projects (2023ZYC012), the Innovation and Entrepreneurship Training Program for College Students, and Innovation Team of Microbial Technology in Hunan University of Arts and Science (202026).

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YX Z, P M and CX L designed the study, ZB Z and P M developed and implemented the program, YX Z, ZF Z and KR H performed the experiments, P M, HX Z and Y W analyzed the data, ZB Z, CX L, YX Z and P M wrote the manuscript, Y W, KR H and P M revised a paper.

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Correspondence to Ping Mo or Kerui Huang.

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The NCBI accession numbers for the 16 S rRNA gene sequence and genome sequence of strain HUAS CB01T are OR237576 and CP129137, respectively.

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Zheng, Y., Mo, P., Li, C. et al. Streptomyces chengbuensis sp. nov., isolated from the rhizosphere soil of Cathaya argyrophylla. J Antibiot (2024).

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